Iron nail. the rest of those are not iron or some form of magnetic material.
<h2>Conduction, Convection, and Radiation</h2>
Explanation:
- The transfer of heat generally depends on the difference in the temperature in the surroundings.
The best methods for the transfer of heat are conduction convection, radiation and sometimes evaporation also.
- Conduction: This is the transfer of heat through the system that is solid.
- Convection: Convection is the process in which warm surfaces of a liquid or gas rises to cooler surfaces in the liquid or gas that is the transfer of heat from the surface. Natural convection occurs as air is heated: it expands, rises, and is replaced by cooler air.
- Radiation: This is a process where energy is radiated among the surroundings in the form of electromagnetic radiation.
- Evaporation: The latent heat of a liquid is used to transfer heat by absorbing the energy needed to evaporate that liquid. The heat absorbed is released by condensing the liquid outside the enclosure.
Pressure = height x density x gravity = 10 x 1000 x 10 = 100 000 Pascals
From Newton's second law:
a = F/mass
Therefore, acceleration of an object rolling a ramp would be:
a = g(sin theta) - friction coefficient (g) (sin theta)
The negative sine is due to the kinetic energy opposing the gravity
We are given that the friction coefficient is zero, the g is a constant = 9.8 m/sec and the acceleration is 2 m/sec^2
Substituting in the equation, we get:
2 = 9.8 sin(theta)
sin (theta) = 0.20408
theta = 11.7757 degrees
The engine's efficiency is (35J)/125J) = 28% .
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